////
This guide is maintained in the main Quarkus repository
and pull requests should be submitted there:
https://github.com/quarkusio/quarkus/tree/master/docs/src/main/asciidoc
////
= Quarkus - Using OAuth2 RBAC

include::./attributes.adoc[]
:extension-name: Elytron Security OAuth2

This guide explains how your Quarkus application can utilize OAuth2 tokens to provide secured access to the JAX-RS endpoints.

OAuth2 is an authorization framework that enables applications to obtain access to an HTTP resource on behalf of a user. 
It can be used to implement an application authentication mechanism based on tokens by delegating to an external server (the authentication server) the user authentification and providing a token for the authentication context.

If your OAuth2 Authentication server provides JWT tokens, you should use link:security-jwt.html[MicroProfile JWT RBAC] instead, this extension aims to be used with opaque tokens and validate the token by calling an introspection endpoint.

== Solution

We recommend that you follow the instructions in the next sections and create the application step by step.
However, you can go right to the completed example.

Clone the Git repository: git clone https://github.com/quarkusio/quarkus-quickstarts.git, or download an archive.

The solution is located in the `security-oauth2-quickstart` {quickstarts-tree-url}/security-oauth2-quickstart[directory].
It contains a very simple UI to use the JAX-RS resources created here, too.

== Creating the Maven project

First, we need a new project. Create a new project with the following command:

[source,shell,subs=attributes+]
----
mvn io.quarkus:quarkus-maven-plugin:{quarkus-version}:create \
    -DprojectGroupId=org.acme \
    -DprojectArtifactId=security-oauth2-quickstart \
    -DclassName="org.acme.oauth2.TokenSecuredResource" \
    -Dpath="/secured" \
    -Dextensions="resteasy-jsonb, security-oauth2"
cd security-oauth2-quickstart
----

This command generates the Maven project with a REST endpoint and imports the `elytron-security-oauth2` extension, which includes the OAuth2 opaque token support.

If you don't want to use the Maven plugin, you can just include the dependency in your pom.xml:
[source,xml]
--
<dependencies>
    <!-- Elytron Security OAuth2 extension -->
    <dependency>
        <groupId>io.quarkus</groupId>
        <artifactId>quarkus-elytron-security-oauth2</artifactId>
    </dependency>
</dependencies>
--


=== Examine the JAX-RS resource

Open the `src/main/java/org/acme/oauth2/TokenSecuredResource.java` file and see the following content:

.Basic REST Endpoint
[source,java]
----
package org.acme.oauth2;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/secured")
public class TokenSecuredResource {

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String hello() {
        return "hello";
    }
}
----

This is a basic REST endpoint that does not have any of the {extension-name} specific features, so let's add some.

We will use the JSR 250 common security annotations, they are described in the link:security.html[Using Security] guide. 

[source,java]
----
package org.acme.oauth2;

import java.security.Principal;

import javax.annotation.security.PermitAll;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.SecurityContext;

@Path("/secured")
@ApplicationScoped
public class TokenSecuredResource {


    @GET()
    @Path("permit-all")
    @PermitAll // <1>
    @Produces(MediaType.TEXT_PLAIN)
    public String hello(@Context SecurityContext ctx) { // <2>
        Principal caller =  ctx.getUserPrincipal(); <3>
        String name = caller == null ? "anonymous" : caller.getName();
        String helloReply = String.format("hello + %s, isSecure: %s, authScheme: %s", name, ctx.isSecure(), ctx.getAuthenticationScheme());
        return helloReply; // <4>
    }
}
----
<1> `@PermitAll` indicates that the given endpoint is accessible by any caller, authenticated or not.
<2> Here we inject the JAX-RS `SecurityContext` to inspect the security state of the call.
<3> Here we obtain the current request user/caller `Principal`. For an unsecured call this will be null, so we build the user name by checking `caller` against null.
<4> The reply we build up makes use of the caller name, the `isSecure()` and `getAuthenticationScheme()` states of the request `SecurityContext`.

== Run the application

Now we are ready to run our application. Use:

[source,shell]
----
./mvnw compile quarkus:dev
----

and you should see output similar to:

.quarkus:dev Output
[source,shell]
----
$ ./mvnw clean compile quarkus:dev
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< org.acme:security-oauth2-quickstart >---------------------
[INFO] Building security-oauth2-quickstart 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
...
[INFO] --- quarkus-maven-plugin:999-SNAPSHOT:dev (default-cli) @ security-oauth2-quickstart ---
Listening for transport dt_socket at address: 5005
2019-07-16 09:58:09,753 INFO  [io.qua.dep.QuarkusAugmentor] (main) Beginning quarkus augmentation
2019-07-16 09:58:10,884 INFO  [io.qua.dep.QuarkusAugmentor] (main) Quarkus augmentation completed in 1131ms
2019-07-16 09:58:11,385 INFO  [io.quarkus] (main) Quarkus 0.20.0 started in 1.813s. Listening on: http://[::]:8080
2019-07-16 09:58:11,391 INFO  [io.quarkus] (main) Installed features: [cdi, resteasy, resteasy-jsonb, security, security-oauth2]

----

Now that the REST endpoint is running, we can access it using a command line tool like curl:

.curl command for /secured/permit-all
[source,shell]
----
$ curl http://127.0.0.1:8080/secured/permit-all; echo
hello + anonymous, isSecure: false, authScheme: null
----

We have not provided any token in our request, so we would not expect that there is any security state seen by the endpoint, and the response is consistent with that:

* user name is anonymous
* `isSecure` is false as https is not used
* `authScheme` is null

So now let's actually secure something. Take a look at the new endpoint method `helloRolesAllowed` in the following:

[source,java]
----
package org.acme.oauth2;

import java.security.Principal;

import javax.annotation.security.PermitAll;
import javax.annotation.security.RolesAllowed;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.SecurityContext;

@Path("/secured")
@ApplicationScoped
public class TokenSecuredResource {

    @GET()
    @Path("permit-all")
    @PermitAll
    @Produces(MediaType.TEXT_PLAIN)
    public String hello(@Context SecurityContext ctx) {
        Principal caller =  ctx.getUserPrincipal();
        String name = caller == null ? "anonymous" : caller.getName();
        String helloReply = String.format("hello + %s, isSecure: %s, authScheme: %s", name, ctx.isSecure(), ctx.getAuthenticationScheme());
        return helloReply;
    }

    @GET()
    @Path("roles-allowed") // <1>
    @RolesAllowed({"Echoer", "Subscriber"}) // <2>
    @Produces(MediaType.TEXT_PLAIN)
    public String helloRolesAllowed(@Context SecurityContext ctx) {
        Principal caller =  ctx.getUserPrincipal();
        String name = caller == null ? "anonymous" : caller.getName();
        String helloReply = String.format("hello + %s, isSecure: %s, authScheme: %s", name, ctx.isSecure(), ctx.getAuthenticationScheme());
        return helloReply;
    }
}
----
<1> This new endpoint will be located at `/secured/roles-allowed`
<2> `@RolesAllowed` indicates that the given endpoint is accessible by a caller if they have either a "Echoer" or "Subscriber" role assigned.

After you make this addition to your `TokenSecuredResource`, try `curl -v http://127.0.0.1:8080/secured/roles-allowed; echo` to attempt to access the new endpoint. Your output should be:

.curl command for /secured/roles-allowed
[source,shell]
----
$ curl -v http://127.0.0.1:8080/secured/roles-allowed; echo
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /secured/roles-allowed HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 401 Unauthorized
< Connection: keep-alive
< Content-Type: text/html;charset=UTF-8
< Content-Length: 14
< Date: Sun, 03 Mar 2019 16:32:34 GMT
<
* Connection #0 to host 127.0.0.1 left intact
Not authorized
----

Excellent, we have not provided any OAuth2 token in the request, so we should not be able to access the endpoint, and we were not. Instead we received an HTTP 401 Unauthorized error. We need to obtain and pass in a valid OAuth2 token to access that endpoint. There are two steps to this, 1) configuring our {extension-name} extension with information on how to validate the token, and 2) generating a matching token with the appropriate claims.

== Configuring the {extension-name} Extension Security Information

include::{generated-dir}/config/quarkus-elytron-security-oauth2.adoc[opts=optional, leveloffset=+1]

=== Setting up application.properties

For part A of step 1, create a `security-oauth2-quickstart/src/main/resources/application.properties` with the following content:

.application.properties for TokenSecuredResource
[source, properties]
----
quarkus.oauth2.client-id=client_id
quarkus.oauth2.client-secret=secret
quarkus.oauth2.introspection-url=http://oauth-server/introspect
----

You need to specify the introspection URL of your authentication server and the `client-id` / `client-secret` that your application will use to authenticate itself to the authentication server.

The extension will then use this information to validate the token and recover the information associate with it.


=== Generating a token

You need to obtain the token from a standard OAuth2 authentication server (https://www.keycloak.org/[Keycloak] for example) using the token endpoint.

You can find below a curl example of such call for a `client_credential` flow:

[source,shell]
----
curl -X POST "http://oauth-server/token?grant_type=client_credentials" \
-H  "Accept: application/json" -H  "Authorization: Basic Y2xpZW50X2lkOmNsaWVudF9zZWNyZXQ="
----

It should respond something like that...

[source,json]
----
{"access_token":"60acf56d-9daf-49ba-b3be-7a423d9c7288","token_type":"bearer","expires_in":1799,"scope":"READER"}
----


== Finally, Secured Access to /secured/roles-allowed
Now let's use this to make a secured request to the `/secured/roles-allowed` endpoint

.curl Command for /secured/roles-allowed With a token
[source,shell]
----
$ curl -H "Authorization: Bearer 60acf56d-9daf-49ba-b3be-7a423d9c7288" http://127.0.0.1:8080/secured/roles-allowed; echo
hello + client_id isSecure: false, authScheme: OAuth2
----

Success! We now have:

* a non-anonymous caller name of client_id
* an authentication scheme of OAuth2

== Roles mapping

Roles are mapped from one of the claims of the introspection endpoint response. By default, it's the `scope` claim. Roles are obtained by splitting the claim with a space separator. If the claim is an array, no splitting is done, the roles are obtained from the array.

You can customize the name of the claim to use for the roles with the `quarkus.oauth2.role-claim` property.

== Package and run the application

As usual, the application can be packaged using `./mvnw clean package` and executed using the `-runner.jar` file:
.Runner jar Example
[source,shell]
----
$ ./mvnw clean package
[INFO] Scanning for projects...
...
$ java -jar target/security-oauth2-quickstart-runner.jar
2019-03-28 14:27:48,839 INFO  [io.quarkus] (main) Quarkus 0.20.0 started in 0.796s. Listening on: http://[::]:8080
2019-03-28 14:27:48,841 INFO  [io.quarkus] (main) Installed features: [cdi, resteasy, resteasy-jsonb, security, security-oauth2]
----

You can also generate the native executable with `./mvnw clean package -Pnative`.
.Native Executable Example
[source,shell]
----
$ ./mvnw clean package -Pnative
[INFO] Scanning for projects...
...
[security-oauth2-quickstart-runner:25602]     universe:     493.17 ms
[security-oauth2-quickstart-runner:25602]      (parse):     660.41 ms
[security-oauth2-quickstart-runner:25602]     (inline):   1,431.10 ms
[security-oauth2-quickstart-runner:25602]    (compile):   7,301.78 ms
[security-oauth2-quickstart-runner:25602]      compile:  10,542.16 ms
[security-oauth2-quickstart-runner:25602]        image:   2,797.62 ms
[security-oauth2-quickstart-runner:25602]        write:     988.24 ms
[security-oauth2-quickstart-runner:25602]      [total]:  43,778.16 ms
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  51.500 s
[INFO] Finished at: 2019-06-28T14:30:56-07:00
[INFO] ------------------------------------------------------------------------

$ ./target/security-oauth2-quickstart-runner
2019-03-28 14:31:37,315 INFO  [io.quarkus] (main) Quarkus 0.20.0 started in 0.006s. Listening on: http://[::]:8080
2019-03-28 14:31:37,316 INFO  [io.quarkus] (main) Installed features: [cdi, resteasy, resteasy-jsonb, security, security-oauth2]
----
